Pipe cutting and threading attachment for rotaries



July 30, 1929. 7 HR. DECKER 1,722,627

I PIPE CUTTING AND THREADING ATTACHMENT FOR ROTARIES Original Filed April 18,v 1922 Patented July 31), i929.

HARRY R. DECKER, OF HOUSTON, TEXAS.

PIPE CUTTING AND THREADING ATTACHMENT FOR ROTABIES.

I Application filed. April 18, 1922, Serial No. 555,219. Renewed December 22, 1928.

This invention relates to new and useful improvements in a pipe cutting and threading attachment for rotaries.

One object of the invention is to provide an attachmentv of the character described which is adapted for use in connection with a rotary for the purpose of cutting off the broken or mutilated end of a pipe and for threading the end of the pipe adjacent the cut off portion.

In well drilling by the rotary process pipe of various kinds is let down into the bore in carrying on the drilling process. This pipe is formed of sections connected by collars into which the adjacent ends of the sections are threaded. The sections must often be unscrewed and separated, and again screwed together in withdrawing the pipe from andletting it down into the bore. Consequently the ends of the pipe section often'bccomes broken or worn and mutilated and should he cut off, and the remaining threads should be chased and additional threads added so that the connecting collar can be easily threaded thereon. it isthe object of this attachment to provide means for quickly and easily reconditioning the ends of these sections. 7

With the above and other objects in view the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein I Figure 1 shows a longitudinal vertical sectional view of the rotary with the attachment applied thereto, and,

Figure 2 shows a plan View partly in h.orizontal section on the line 2-2 of Figure 1.

In the drawings the numeral 1 designates the foundation timbers upon which the base plate 2 rests. The numeral 3 designates the rotary table having the marginal beveled face 4 on its under side in mesh with the pinion 5, which is fixed on. the drive shaft 6. The rotary table runs on anti-friction bearings 7 located in suitable raceways of the base plate and table. The base plate and rotary table have vertical aligned openings, and detachably secured to the base plate there is a tubular holder 8 whose upper end extends up into the opening of the rotary table. This holder ,is tubular, as stated to permit the passage of pipe 9 therethrough. The rotary table is provided with .one or more sockets 10, in its upper face to receive the lower end of the post 11. A tong 12 may be secured to the pipe, and its outer end may be connected to the upper end of the post 11. When the table is rotated this post and tong will rotate the pipe 9 also. Seated in the upper end of the holder and interlocked therewith there is a cutter head 13 which is supported on the transverse web 14 formed with a central opening to permit the passage of the pipe through it. Slidahly mounted in a radial bearing in the head. there is a blade holder 15, whose outer end is beveled and whose inner end carries the cutter blade 16. Operating against the outer beveled end of the blade holder there is a block 17 whose face abutting against said blade holder is correspondingly beveled. Threaded downwardly through said head there is a shaft 18 whose lower end oprotated and with each rotation thereof the U arms 21 will strike against and partially rotate the star wheel 19, and this will operate through the shaft 18 to gradually force the block 17 downwardly, and the cutter head inwardly carrying the cutter 16 into contact with and forcingit into the material of'the pipe. 7 The pipe rotates with the rotary table and the lower mutilated end thereof will eventually be severed by said cutter. lVhen this end is cut off the pipe will then be elevated a distance above the head 13, and the chaser carrier 22 is then seated in the head 13 and keyed therein by means of the key 28. This carrier is annular in form, and within it there is a chaser actuating ring 23 whose inner wall is formed into a plurality of correspondingly shaped cam faces 29 against which the outer ends .of the radial thread 'chasers 24 rest. The margin of the ring 23 has worm gear teeth with which the worm gear 25-meshes Connected to this gear 25 is a detachable handle 26 whose outer end carries a hand wheel 27. When the threading attachment is assembled the pipe is then lowered, and the rotary table again started and as the pipe 9 is rotated the chasers will renew the old threads left on the end of the pipe and will cut the required number of additional threads. The chasers are then released from the pipe by turing the screw gear 25 in the proper direction to permit the spreading of said chasers, and the pipe is elevated above them and the screw gear 25' is then turned in the opposite direction, the cam iaces operating to force the chasers toward each other-the required distance. The pipe is again lowered and rotated through'said chasers, and the threads are cut deeper. The process is repeated until the threads are completed.

The attachment hereinabove described is thus utilized in combination with the rotary for renewingthe worn out ends of the pipe used in drilling operations and saves much timeand labor for the reason that the work can'be done at the place where the operations are being carried on, and thus makes itunn'ecessary to load and haul the pipe to a shop where this character of work is usually done. 7

What I claim is i 1. The combination with a base, of a rotary table mounted thereon and formed with a vertical opening to receive a pipe, a detachable tubular holder supported by the base and extending up into said opening, a pipe cutting means actuated by the rotary table and adapted to contact with and sever said pipe and a pipe threading attachment supported by said holder and adapted to thread the end of said pipe.

2. The combination with a rotary drilling machine including a base and a rotary table, having a vertical opening, to receive and rotate a pipe, of a tubular holder supported by the base and extending up into said opening, a pipe cutting attachment carried by said holder and adapted to be actuated by the table as it rotates to sever said pipe, a pipe threading attachment supported by said holder and adapted to thread the adjacent end of the pipe as the pipe is rotated by the table.

3. The combination with a base of a rotary table mounted thereon and adapted to engage with a pipe to rotate the same, a holder supported by the base and extending up through the table, a pipe cutter mounted on said holder and adapted to be actuated by the table, as it turns, into contact, with the pipe'to sever the same and a pipe tlireader supported by said holder and including threaded chasers and means for actuating the chasers into and out of con tact with the pipe to form threads thereon.

4. The combination with a base and a rotary table thereon, each having a vertical opening to receive a pipe, of means carried by the rotary table adapted to engage with and rotate the pipe, a pipe cutting apparatus, and a pipe threading apparatus, associated with the rotary table, said cutting apparatus including a cutter blade, said table carrying means arranged to actuate said apparatus, as the table rotates, to force said blade against the rotating pipe, whereby said pipe is severed. I

5. The combination with a base and a rotatable table, mounted thereo'n,'each having a vertical opening to receive a pipe, of means carried by the table and adapted to engage with and rotate the pipe, a head associated with the rotary table, a cutter slidably mounted in said head, a thread chaser also associated with the table, means actuated by the table, as it rotates, to force said cutter against the rotating pipe, and means for actuating the chaser into working relation with the pipe.

6. In a rotary drilling machine having a base and a rotary table thereon provided with a vertical opening to receive a pipe; a

tubular holder on the base aligned with said opening, a pipe cutting means arranged tobe actuated by the table and effective to sever a pipe and a pipethreading attachment associated with the holder and adapted to thread the end of said pipe. I

In testimony whereof I have signed my name to this specification.

HARRY R. DECKER. 

